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Officials at the base in central Texas could not have predicted a shooting rampage last year in part because the troubled soldier behind the attack gave no clear warning that he posed a threat, according to an Army report.

Post-deployment health assessments showed that more than 600 American service members since 2003 have indicated they believed they had been exposed to chemical warfare agent. Following are two such surveys, with names redacted to protect patients’ privacy.

An unclassified summary of an Army report released to Congress in 2006 stated that since 2003 allied forces in Iraq had recovered about 500 chemical weapons. By that time chemical weapons recoveries were accelerating sharply; the number understated the actual number of chemical weapons found and has never been publicly updated.